1 package org.apache.lucene.index;
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with
6 * this work for additional information regarding copyright ownership.
7 * The ASF licenses this file to You under the Apache License, Version 2.0
8 * (the "License"); you may not use this file except in compliance with
9 * the License. You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
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14 * distributed under the License is distributed on an "AS IS" BASIS,
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20 import org.apache.lucene.store.Directory;
21 import org.apache.lucene.store.FSDirectory;
22 import org.apache.lucene.util.Constants;
23 import org.apache.lucene.util.Version;
26 import java.io.IOException;
27 import java.io.PrintStream;
28 import java.util.Collection;
31 * This is an easy-to-use tool that upgrades all segments of an index from previous Lucene versions
32 * to the current segment file format. It can be used from command line:
34 * java -cp lucene-core.jar org.apache.lucene.index.IndexUpgrader [-delete-prior-commits] [-verbose] indexDir
36 * Alternatively this class can be instantiated and {@link #upgrade} invoked. It uses {@link UpgradeIndexMergePolicy}
37 * and triggers the upgrade via an forceMerge request to {@link IndexWriter}.
38 * <p>This tool keeps only the last commit in an index; for this
39 * reason, if the incoming index has more than one commit, the tool
40 * refuses to run by default. Specify {@code -delete-prior-commits}
41 * to override this, allowing the tool to delete all but the last commit.
42 * From Java code this can be enabled by passing {@code true} to
43 * {@link #IndexUpgrader(Directory,Version,PrintStream,boolean)}.
44 * <p><b>Warning:</b> This tool may reorder documents if the index was partially
45 * upgraded before execution (e.g., documents were added). If your application relies
46 * on "monotonicity" of doc IDs (which means that the order in which the documents
47 * were added to the index is preserved), do a full forceMerge instead.
48 * The {@link MergePolicy} set by {@link IndexWriterConfig} may also reorder
51 public final class IndexUpgrader {
53 private static void printUsage() {
54 System.err.println("Upgrades an index so all segments created with a previous Lucene version are rewritten.");
55 System.err.println("Usage:");
56 System.err.println(" java " + IndexUpgrader.class.getName() + " [-delete-prior-commits] [-verbose] indexDir");
57 System.err.println("This tool keeps only the last commit in an index; for this");
58 System.err.println("reason, if the incoming index has more than one commit, the tool");
59 System.err.println("refuses to run by default. Specify -delete-prior-commits to override");
60 System.err.println("this, allowing the tool to delete all but the last commit.");
61 System.err.println("WARNING: This tool may reorder document IDs!");
65 @SuppressWarnings("deprecation")
66 public static void main(String[] args) throws IOException {
68 boolean deletePriorCommits = false;
69 PrintStream out = null;
70 for (String arg : args) {
71 if ("-delete-prior-commits".equals(arg)) {
72 deletePriorCommits = true;
73 } else if ("-verbose".equals(arg)) {
75 } else if (dir == null) {
85 new IndexUpgrader(FSDirectory.open(new File(dir)), Version.LUCENE_CURRENT, out, deletePriorCommits).upgrade();
88 private final Directory dir;
89 private final PrintStream infoStream;
90 private final IndexWriterConfig iwc;
91 private final boolean deletePriorCommits;
93 /** Creates index upgrader on the given directory, using an {@link IndexWriter} using the given
94 * {@code matchVersion}. The tool refuses to upgrade indexes with multiple commit points. */
95 public IndexUpgrader(Directory dir, Version matchVersion) {
96 this(dir, new IndexWriterConfig(matchVersion, null), null, false);
99 /** Creates index upgrader on the given directory, using an {@link IndexWriter} using the given
100 * {@code matchVersion}. You have the possibility to upgrade indexes with multiple commit points by removing
101 * all older ones. If {@code infoStream} is not {@code null}, all logging output will be sent to this stream. */
102 public IndexUpgrader(Directory dir, Version matchVersion, PrintStream infoStream, boolean deletePriorCommits) {
103 this(dir, new IndexWriterConfig(matchVersion, null), infoStream, deletePriorCommits);
106 /** Creates index upgrader on the given directory, using an {@link IndexWriter} using the given
107 * config. You have the possibility to upgrade indexes with multiple commit points by removing
108 * all older ones. If {@code infoStream} is not {@code null}, all logging output will be sent to this stream. */
109 public IndexUpgrader(Directory dir, IndexWriterConfig iwc, PrintStream infoStream, boolean deletePriorCommits) {
112 this.infoStream = infoStream;
113 this.deletePriorCommits = deletePriorCommits;
116 public void upgrade() throws IOException {
117 if (!IndexReader.indexExists(dir)) {
118 throw new IndexNotFoundException(dir.toString());
121 if (!deletePriorCommits) {
122 final Collection<IndexCommit> commits = IndexReader.listCommits(dir);
123 if (commits.size() > 1) {
124 throw new IllegalArgumentException("This tool was invoked to not delete prior commit points, but the following commits were found: " + commits);
128 final IndexWriterConfig c = (IndexWriterConfig) iwc.clone();
129 c.setMergePolicy(new UpgradeIndexMergePolicy(c.getMergePolicy()));
130 c.setIndexDeletionPolicy(new KeepOnlyLastCommitDeletionPolicy());
132 final IndexWriter w = new IndexWriter(dir, c);
134 w.setInfoStream(infoStream);
135 w.message("Upgrading all pre-" + Constants.LUCENE_MAIN_VERSION + " segments of index directory '" + dir + "' to version " + Constants.LUCENE_MAIN_VERSION + "...");
137 w.message("All segments upgraded to version " + Constants.LUCENE_MAIN_VERSION);